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Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,795,025	$ 4,672,909
Less: unearned income and deferred costs and fees	(3,832)	(3,789)
Total loans and leases, net of unearned income and deferred costs and fees	4,791,193	4,669,120
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,510,838	4,362,332
Less: unearned income and deferred costs and fees	(3,832)	(3,789)
Total loans and leases, net of unearned income and deferred costs and fees	4,507,006	4,358,543
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	284,187	310,577
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	284,187	310,577
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,080,641	1,091,651
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	95,618	108,608
Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	985,023	983,043
Commercial and industrial | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,034,676	1,040,675
Commercial and industrial | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	95,618	108,608
Commercial and industrial | Originated | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	939,058	932,067
Commercial and industrial | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	45,965	50,976
Commercial and industrial | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial and industrial | Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	45,965	50,976
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,305,227	2,200,727
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	143,465	129,959
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,927,408	1,866,802
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	234,354	203,966
Commercial real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,113,837	1,992,980
Commercial real estate | Originated | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	143,229	129,712
Commercial real estate | Originated | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,737,686	1,660,782
Commercial real estate | Originated | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	232,922	202,486
Commercial real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	191,390	207,747
Commercial real estate | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	236	247
Commercial real estate | Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	189,722	206,020
Commercial real estate | Acquired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,432	1,480
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,329,611	1,302,941
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	232,245	241,256
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,097,366	1,061,685
Residential real estate | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,283,685	1,251,852
Residential real estate | Originated | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	207,820	212,812
Residential real estate | Originated | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,075,865	1,039,040
Residential real estate | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	45,926	51,089
Residential real estate | Acquired | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	24,425	28,444
Residential real estate | Acquired | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	21,501	22,645
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	65,085	63,123
Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	53,034	50,979
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12,051	12,144
Consumer and other | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	64,179	62,358
Consumer and other | Originated | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	52,128	50,214
Consumer and other | Originated | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12,051	12,144
Consumer and other | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	906	765
Consumer and other | Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	906	765
Consumer and other | Acquired | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	14,461	14,467
Leases | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	14,461	14,467
Leases | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 0	$ 0

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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